Question

A particle moving along x-axis has, at any instant, its coordinate to be x=4+3t+5t^2. What is the value of dx/dt at t=1?

Answer 1

Answer:

x=4+3t+5t^2

dx/dt= d/dx (4)+d/dx(3t)+d/dx(5t^2)

= 0+3+10t

=10t+3

When t=1

10(1)+3 =13

Answer: 13

Answer 2

Answer:

13 is the correct answer